package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;


@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws Exception {
        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();//方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获取注解的Class对象
        OperationType operationType = autoFill.value();//获得value信息及数据库操作类型
        //获取到当前被拦截方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if( args ==null || args.length == 0){
            return;
        }
        Object entity = args[0];//约定第一个参数为实体对象
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long Currentid = BaseContext.getCurrentId();

        //通过反射为对应的属性进行赋值
        if(operationType == OperationType.INSERT){
            //进行四个赋值操作
            Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            setCreateTime.invoke(entity,now);
            setCreateUser.invoke(entity,Currentid);
            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,Currentid);
        }else if(operationType == OperationType.UPDATE){
            //进行两个赋值操作
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            setUpdateTime.invoke(entity,now);
            setUpdateUser.invoke(entity,Currentid);

        }
    }
}
